The MPU module can be waked up by the unexpected USB
interrupt(HSUSB_MC_NINT). For instance, if the MUSB is working as
peripheral mode and connected to a host PC, it can never enter the low
power mode due to interrupts from the host PC. This patch added the
feature that a board specific file can determines that TWL4030
supplies the USB power or not in the low power mode. Disabling the USB
power may save the power consumption.
Signed-off-by: Minkyu Kang <mk7.kang@xxxxxxxxxxx>
Signed-off-by: Kim Kyuwon <chammoru@xxxxxxxxx>
---
drivers/usb/otg/twl4030-usb.c | 25 +++++++++++++++++++++++++
include/linux/i2c/twl4030.h | 1 +
2 files changed, 26 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/otg/twl4030-usb.c b/drivers/usb/otg/twl4030-usb.c
index 416e441..b725be2 100644
--- a/drivers/usb/otg/twl4030-usb.c
+++ b/drivers/usb/otg/twl4030-usb.c
@@ -256,6 +256,7 @@ struct twl4030_usb {
u8 linkstat;
u8 asleep;
bool irq_enabled;
+ bool suspend_enabled;
};
/* internal define on top of container_of */
@@ -618,6 +619,7 @@ static int __init twl4030_usb_probe(struct platform_device *pdev)
twl->otg.set_suspend = twl4030_set_suspend;
twl->usb_mode = pdata->usb_mode;
twl->asleep = 1;
+ twl->suspend_enabled = pdata->suspend_enabled;
/* init spinlock for workqueue */
spin_lock_init(&twl->lock);
@@ -694,9 +696,32 @@ static int __exit twl4030_usb_remove(struct platform_device *pdev)
return 0;
}
+int twl4030_usb_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ struct twl4030_usb *twl = platform_get_drvdata(pdev);
+
+ if (!twl->suspend_enabled)
+ return 0;
+
+ otg_set_suspend(&twl->otg, 1);
+
+ return 0;
+}
+
+int twl4030_usb_resume(struct platform_device *pdev)
+{
+ struct twl4030_usb *twl = platform_get_drvdata(pdev);
+
+ otg_set_suspend(&twl->otg, 0);
+
+ return 0;
+}
+
static struct platform_driver twl4030_usb_driver = {
.probe = twl4030_usb_probe,
.remove = __exit_p(twl4030_usb_remove),
+ .suspend = twl4030_usb_suspend,
+ .resume = twl4030_usb_resume,
.driver = {
.name = "twl4030_usb",
.owner = THIS_MODULE,
diff --git a/include/linux/i2c/twl4030.h b/include/linux/i2c/twl4030.h
index c89d33b..0b12509 100644
--- a/include/linux/i2c/twl4030.h
+++ b/include/linux/i2c/twl4030.h
@@ -325,6 +325,7 @@ enum twl4030_usb_mode {
struct twl4030_usb_data {
enum twl4030_usb_mode usb_mode;
+ bool suspend_enabled;
};
struct twl4030_ins {
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
